7 Reasons XFast USB Is the Best Choice for Fast Data Transfer

XFast USB vs. Standard USB — Real-World Speed Tests and Results

What XFast USB is

• XFast USB is ASRock’s software utility that claims to increase USB transfer performance by optimizing USB bus handling and applying a QoS-like prioritization and caching layer (historically bundled with ASRock motherboards).

How tests are typically done

• Common benchmarks: CrystalDiskMark, AS SSD, ATTO, HD Tune, and file-copy tests (e.g., RichCopy, DiskBench) using flash drives or external HDD/SSD.
• Tests compare identical hardware with XFast enabled vs. disabled (or vs. other motherboards without XFast).

Typical real-world findings (summary of multiple reviews)

• Sequential read/write (large files): XFast USB often shows clear improvement — commonly 20–100% faster in some synthetic and file-copy tests when transferring from USB drive to internal HDD/SSD. Some early reviews reported up to ~5x gains in short cached transfers, but larger-file results are usually smaller (often ~1.2–2x).
• Small random / 4K IOPS: Gains are mixed. Some benchmarks show modest improvements at higher queue depths; others show little change or even minor decreases depending on the device and firmware.
• Caching effects: Very large gains reported in some short tests are often due to RAM caching. When transfers fit in system RAM cache, speeds appear much higher; sustained large transfers reduce that advantage.
• UASP / protocol-level benefits: Separate technologies like UASP (USB Attached SCSI) provide real, measurable gains for SSDs over USB 3.0. XFast USB is a host-side utility and can complement but not replace protocol/driver-level features.
• Consistency: Results vary by flash drive/enclosure controller, OS, driver versions, ASRock XFast version, and whether tests are read or write. Newer USB controllers and native UASP support lessen the relative impact of XFast.

Practical takeaways

• Use XFast USB if you have an ASRock board and want an easy way to try improved transfer times—you may see noticeable gains for many USB flash drives, especially for read-heavy or small-to-medium transfers.
• For sustained, high-performance external storage, prioritize:
  1. A USB controller with UASP support,
  2. High-quality flash drive or external SSD/enclosure,
  3. Modern USB standard (USB 3.⁄₃.2 / Type-C) and up-to-date drivers.
• Beware of cached-test artifacts: validate gains with sustained large-file transfers (e.g., 10–20 GB) to measure real-world sustained throughput.

Example numbers (representative, not guaranteed)

• Small cached transfer (few GB): XFast may report up to 300–600 MB/s vs. 60–150 MB/s without (cache-inflated).
• Sustained large transfer (10–20 GB): typical real gains ~10–100% depending on device; some tests show ~1.5–2x improvement in read, smaller for writes.

If you want, I can run a concise test plan you can follow (tools, commands, and exact steps) to measure XFast USB vs. standard USB on your system.